Water at the rate of 86 kg/min is heated from 20 to 70-C by an oil having a specific heat of 1.9 kJ/kg.-C. The fluids are used in a counterflow double-pipe heat exchanger, and the oil enters the exchanger at 110-C and leaves at 70-C. The overall heat-transfer coefficient is 230 W/m2.-C. Calculate the heat transfer rate, kW. (A) 136.2 B) 189.5 C) 300.0 (D) 108.9

Water at the rate of 86 kg/min is heated from 20 to 70-C by an oil having a specific heat of 1.9 kJ/kg.-C. The fluids are used in a counterflow double-pipe heat exchanger, and the oil enters the exchanger at 110-C and leaves at 70-C. The overall heat-transfer coefficient is 230 W/m2.-C. Calculate the heat transfer rate, kW. (A) 136.2 B) 189.5 C) 300.0 (D) 108.9

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter10: Heat Exchangers

Section: Chapter Questions

Problem 10.16P

See similar textbooks

Similar questions

10.1 In a heat exchanger, as shown in the accompanying figure, air flows over brass tubes of 1.8-cm 1D and 2.1-cm OD containing steam. The convection heat transfer coefficients on the air and steam sides of the tubes are , respectively. Calculate the overall heal transfer coefficient for the heal exchanger (a) based on the inner tube area and (b) based on the outer tube area.
Water flowing in a long, aluminum lube is to be heated by air flowing perpendicular to the exterior of the tube. The ID of the tube is 1.85 cm, and its OD is 2.3 cm. The mass flow rate of the water through the tube is 0.65kg/s, and the temperature of the water in the lube averages 30C. The free-stream velocity and ambient temperature of the air are 10m/sand120C, respectively. Estimate the overall heat transfer coefficient for the heat exchanger using appropriate correlations from previous chapters. State all your assumptions.
What is the main difference between a copper and a cupronickel coaxial heat exchanger, and where is each used?
Oil in an engine is being cooled by air in a crossflow heat exchanger, where both fluids are unmixed. Oil (cph = 2047 J/kg·K) flowing with a flow rate of 0.026 kg/s enters the heat exchanger at 75°C, while air (cpc = 1007 J/kg·K) enters at 30°C with a flow rate of 0.21 kg/s. The overall heat transfer coefficient of the heat exchanger is 53 W/m2·K and the total surface area is 1 m2. Determine (a) the heat transfer effectiveness and (b) the outlet temperature of the oil.
3. In a shell-and-tube heat exchanger, water enters at 85°C at the rate of 5.4 kg/s. Engine oil enters at 20°C and leaves at 60°C. The water leaves the heat exchanger at 57°C. What is the mass flow rate of the engine oil? Express your answer in kg/s.